Grinding-machine.



B. M. W. HANSON.

GRINDING MACHINE.

APPLICATION FILED SEPT. 2, 1909.

975,382. Patented Nov. 8, 1910.

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B. M. W. HANSON.

GRINDING MACHINE.

APPLICATION FILED SEPT. 2, 1909.

Patented Nov. 8, 1910.

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In ventor E. M Wifansan By kis'Afiorneyag THE uonms PETERS co,wasmmcmzv, D c,

UNIE TATFL PATEN OFFICE.

BENGT M. W. HANSON, OF HARTFORD, CONNECTICUT, ASSIGNOR TO PRATT &WHITNEY COMPANY, OF HARTFORD, CONNECTICUT, A CORPORATION OF NEW JERSEY.

GRINDING-MACHINE.

Original application filed April 20, 1909, Serial No. 491,102.

To all whom 'it may concern Be it known that I, BENGT M. W. HANSON, acitizen of the United States, residing at Hartford, in the county ofHartford and State of Connecticut, have invented certain new and usefulImprovements in Grinding Machines, of which the following is aspecification.

This invention relates to grinding machines the object of theinventionbeing to provide an effective means for driving the grindingwheel and for reclprocating the carriage, which is of such nature thatwhen the grinding wheel is speeded up to cornpensate for peripheral wearthe carriage Wlll be positively caused to remain at the same speed.

In the drawings accompanying and forming part of the presentspecification I illustrate in detail one form of embodiment of theinvention which to enable those skilled in the art to practice the samewill be fully set forth in the following description while the noveltyof the invention will be included in the claims succeeding saiddescription.

Referring to said drawings, Figure 1 is a front elevation of a grindingmachine involving my invention. Fig. 2 is a rear elevation of saidmachine. Fig. 3 is a front elevation on a somewhat larger scale ofportion of the driving mechanism, and, Fig.

4: is a view on a similar scale of the parts shown in said Fig. 3 and asseen from the right in the latter figure.

Like characters refer to like throughout the several figures.

The present application is a division of my application Serial No.491,102 filed April 20, 1909 now merged in Patent No. 948,697 ofFebruary 8, 1910.

I shall describe somewhat briefly a grinding machine possessing certainknown features so that it will be more easy to understand the nature ofthe present invention and in Figs. 1 and 2 of the drawings appears sucha machine which comprises a bed as 2 upon which is mounted forreciprocation longitudinally thereof the work-carriage 3 provided with ahead-stock 4L and a tail-stock 5 between spindles 6 and 7 respectivelyof which the work (not shown) is supported. The head stock 4: sustains apulley 8 connected through the intervention of suitable mechanism withsaid spindle 6 so parts Specification of Letters Patent.

Patented Nov. 8, 191.0.

Divided and this application filed September 2,

Serial No. 515,907.

that when said pulley is rotated the work will be turned. Over thepulley 8 is passed a belt 9 connected with an overhead drum 10 thelength of which equals approximately the traverse of the carriage sothat no matter wheresaid carriage may be within the limits of its strokeit will be in driving connection with said overhead drum. In connectionwith said belt is a belt-tightener such as that denoted in a general wayby 11. The shaft for the drum 10 is denoted by 10 and it is sustained bythe standards or uprights 12 and 13 rising from and fastened to the bed2. The said drum therefore while overhead is not carried by a shaftseparate or independent of the machine but forms an organized part ofthe machine and presents a very effective means for turning or .drivingthe work in that as will hereinafter appear the machine may be driven byan electric motor. It is therefore evident that no undue care need beexercised in placing the machine upon a factory floor, the onlyrequisite being the proper relative positions of the driving motor andthe machine itself.

I have shown as fastened to one end of the shaft 10 a cone pulley 1dconnected by a belt 15 with a similarly constructed but oppositelydisposed pulley 16 fastened to the shaft 17 rotatively supported bysuitable bearings upon the bed 2 said two cone pulleys and the beltpresenting a simple means for driving the said overhead drum l0 and foralso changing the speed thereof.

The tool-carriage is denoted by 18 and it has a reciprocatory movementupon the upper surface of the bed 2 transversely thereof. Thegrinding-wheel is designated by 19 being suitably supported by saidtoolcarriage and being operatively connected with the pulley 20 althoughthe intermediate connections are not shown. Said pulley 20 is fastenedto a shaft 21 on the carriage 18 and I will hereinafter indicate howsaid shaft 21 is driven.

The carriage 3 is reciprocated by connections driven from the shaft 17but I have not deemed it necessary to describe or show the connectionsbetween said shaft 17 and the said work-carriage as the same are so wellknown. I might at this point however consider the shaft 17 acarriage-reciprocating shaft and the shaft 21 a tool-turning or drivingshaft. Upon one end of said tooldriving shaft 21 I have shown fastened apulley 22 connected by a belt 22 with the pulley 23 fastened to theshaft 2 1 mounted upon suitable bearings upon the base of the machine.Therefore when the shaft 24 is turned the tool 19 will be operated. Tosaid shaft 2 1 is rigidly connected a cone pulley 25 shown as having twosteps and which is adapted to be driven by a belt 26 extending from asuitable motor. It will be evident that by means of the stepped conepulley 25 the speed of the shaft 2 1- may be varied and this variationin speed is what I utilize in the present instance to increase the speedof the grinding wheel 19 when the latter has its surface worn away orreduced by reason of use. At the commencement of operation or when thegrinding wheel 19 is new the belt 26 will. be on the large step of thepulley 25; when the working surface of said grinding wheel is worn awayin the manner indicated said belt will be shifted onto the smaller stepof said pulley 25 so that the speed of the grinding wheel will beincreased and although, as will hereinafter appear, thecarriage-reciprocating shaft 17 is driven from said shaft 24, the speedof the carriage will not be changed the parts being so related that therelative velocities of the same will remain constant. The shaft 24 isshown as having fixed to one end thereof the pinion 27 in mesh with aspur-gear 28 both said gears being incased in a boxing 29 on theframework of the machine, and said spur gear 28 being fastened to ashaft 30 also supported by said framework. To said shaft 30 is alsofastened a stepped cone pulley 31 connected by a belt 32 with a steppedpulley 33 the steps of which face oppositely to those of the pulley 31.Owing to the presence of the speed-reducing gears 27 and 23 I can drivethe carriage-reciprocating shaft 17 at a relatively slow speed at alltimes.

As intimated hereinbefore when the grinding wheel 19 is new the belt 26will be on the large section of the cone pulley 25 while the belt willbe on the small section of the pulley 33 and the larger step of thepulley 31 by reason of which the grinding wheel 19 and the carriage 3will be operated at the proper relative speeds. Should the attend ant ofthe machine see the necessity of speeding up said grinding wheel he willshift the belt 26 onto the smaller section of the pulley 25 andsimultaneously shift the belt 32 from the smaller section of the pulley33 and naturally at the same time from the larger step of the pulley 31onto the smaller step thereof and although the speed of the shaft 24 isincreased the speed of the shaft 17 will not be. 1 provide means wherebyit will be impos ible to shift one of said belts 26 and 32 withoutsimultaneously shifting the other although as will hereinafter appearthe belt 26 has a movement while the belt 32 is at rest, this being duesimply to the fact that the belt 26 is somewhat wider than the belt 32.I should state at this point that in Figs. 2 and 3 the belts are shownas occupying their shifted positions and also that with the exception ofa portion of the belt 26 in Fig. 1, all the belts are represented, forclearness, in dotted lines; The belt-shifting mechanism is best shown inthe enlarged Figs. 3 and 4 and the same comprises a shifter rod 34 whichwith its adjuncts is shown in Fig. 3 as occupying its two extremepositions by dotted and full lines respectively, the full line positionof said shifter rod being what has been considered as the shiftedposition thereof. Said rod is supported by suitable bearings on theframework and it has a splined connection. as 35 therewith so that assaid rod slides back and forth it cannot turn. Said rod 34: is shown asequipped with two forks 36 and 37 the fork 36 being somewhat wider thanthe belt 32. It is therefore clear that one of said belts (26 and 32)cannot be shifted without shifting the other although the fork 37 hassome lost motion caused by the difference in width of the two belts. Thefork 37 by abutting against the framework limits the motion of the rod3st in one direction while the stop 38 limits the movement of said rodin the opposite direction. By the construction described nothing is leftto chance which might be the case were the belts 26 and 32 separatelyshifted for an at tendant might shift one and neglect to shift theother.

I do not restrict myself to the exact disclosure made by theaccompanying drawings and description as certain changes may be madewithin the scope of my invention. I wish also to state that there arecertain features hereinbefore described and illustrated in theaccompanying drawings which are not claimed herein but which are claimedin the parent application to which I have already alluded.

What I claim is:

1. The combination of a base or bed, a work carriage reciprocatorylongitudinally of said bed, a tool carriage movable transversely of saidbed, a tool operating device cooperative with and for operating the toolon said tool carriage, a carriage reciprocating device for reciprocatingthe carriage,

and mechanism for operating the tool operating device and the carriagereciprocating device, said mechanism involving means operable at willfor increasing the speed of the tool operating device and for positivelypreventing an increase in speed of the carriage reciprocating devicewhen the speed of the tool operating device is increased.

2. The combination of a bed, a work carriage reciprocatory on said bed,a tool carriage movable transversely of the bed, standards rising fromthe bed, a shaft supported by said standards, a drum connected With saidshaft, the length of the drum equaling approximately the length ofmovement of said Work carriage, a Work supporting spindle on the Workcarriage, a pulley connected with said spindle and adapted to be drivenby said drum through a belt in the different positions of the Workcarriage, a carriage reciprocating device, a tool operating device foroperating the tool on the tool carriage, mechanism for operating saidcarriage reciprocating and tool operating devices, said mechanisminvolving hand operable means for increasing the speed of the tooloperating device and for positively preventing an increase of speed ofthe carriage reciprocating device when the speed of the tool operatingdevice is increased, and operative connections between one of saidoperating devices and said drum.

In testimony whereof I altix my signature in presence of two Witnesses.

BENGT M. V. HANSON. lVitnesses F. E. ANnnRsoN, CHAS. E. HOLT.

